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Arxiv.org
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We report the discovery with the proportional counter array (PCA) onboard the Rossi X-ray Timing Explorer (RXTE) of a 450 Hz quasiperiodic oscillation (QPO) in the hard X-ray flux from the galactic microquasar GRO J1655-40. This is the highest frequency QPO modulation seen to date from a black hole. The QPO is detected only in the hard X-ray band above 13 keV. It is both strong and narrow, with a typical rms amplitude of 4.5 % in the 13 - 27 keV range, and a width of 40 Hz (FWHM). For two...
Source: http://arxiv.org/abs/astro-ph/0104487v1
Arxiv.org
by L. Cerrigone; G. Umana; C. Trigilio; P. Leto; C. Buemi; Joseph L. Hora
texts
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We have selected a small sample of post-AGB stars in transition towards the planetary nebula and present new Very Large Array multi-frequency high-angular resolution radio observations of them. The multi-frequency data are used to create and model the targets' radio continuum spectra, proving that these stars started their evolution as very young planetary nebulae. In the optically thin range, the slopes are compatible with the expected spectral index (-0.1). Two targets (IRAS 18062+2410 and...
Source: http://arxiv.org/abs/0807.3684v2
Arxiv.org
by Tim van Kempen; Steve Longmore; Doug Johnstone; Thushara Pillai; Asuncion Fuente
texts
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Intermediate mass protostars, the bridge between the very common solar-like protostars and the more massive, but rarer, O and B stars, can only be studied at high physical spatial resolutions in a handful of clouds. In this paper we present and analyze the continuum results from an observing campaign at the Submillimeter Array targeting two well-studied intermediate mass protostars in Orion, NGC 2071 and L1641 S3 MMS 1. The extended SMA (eSMA) probes structure at angular resolutions up to...
Source: http://arxiv.org/abs/1203.3718v1
Arxiv.org
by Jan Forbrich; Rachel A. Osten; Scott J. Wolk
texts
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Young Stellar Objects (YSOs) and in particular protostars are known to show a variety of high-energy processes. Observations in the X-ray and centimetric radio wavelength ranges are thought to constrain some of these processes, e.g., coronal-type magnetic activity. There is a well-known empirical correlation of radio and X-ray luminosities in active stars, the so-called Guedel-Benz relation. Previous evidence whether YSOs are compatible with this relation remains inconclusive for the earliest...
Source: http://arxiv.org/abs/1105.0923v1